PSYC 1000 Lecture 30: psych notes - module 30 - nov 3.docx
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Psych Notes – Module 30 – Assessing Intelligence
Mental Age – a measure of intelligence test performance devised by Binet; the chronological
age that most typically corresponds to a given level of performance. Thus, a child who does as
well as the average 8 year old is said to have a mental age of 8.
Stanford-Binet – the widely used American revision of Binet’s original intelligence test.
Intelligence quotient (IQ) – defined originally as the ratio of mental age (ma) to chronological
age (ca) multiplied by 100 (IQ = MA/CA X100). On contemporary intelligence tests, the average
performance for a given age is assigned a score of 100.
Achievement test – a test designed to assess what a person has learned.
Aptitude test – a test designed to predict a person’s future performance; aptitude is the capacity
Wechsler Adult Intelligence Scale (WAIS) – the WAIS is the most widely used intelligence test;
contains verbal and performance (nonverbal) subtests.
Standardization – defining meaningful scores by comparison with the performance of a
Normal curve – the symmetrical bell-shaped curve that describes the distribution of many
physical and psychological attributes. Most scores fall near the average, and fewer and fewer
scores lie near the extremes.
Reliability – the extent to which a test yields consistent results as assessed by the consistency
of scores on two halves of the test, or on retesting.
Validity – the extent to which a test measures or predicts what it is supposed to.
Content validity – the extent to which a test samples the behaviour that is of interest.
Predictive validity – the success with which a test predicts the behaviour it is designed to
predict; it is assessed by computing the correlation between test scores and the criterion
Cohort – a group of people from a given time period
Crystallized intelligence – our accumulated knowledge and verbal skills; tends to increase with
Fluid intelligence – our ability to reason speedily and abstractly; tends to decrease during late
Intellectual disability – a condition of limited mental ability, indicated by an intelligence score of
70 or below and difficulty in adapting to the demands of life; varies from mild to profound.
Down syndrome – a condition of mild to severe intellectual disability and associated physical
disorders caused by an extra copy of chromosome 21.
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